Spring bolt



July 26, 1949.

J. H. OSWALD ET AL SPRING BOLT Filed July 1, 1947 INVENTORS ATTORNEYPatented July 26, 1949 UNITED STATES ATENT OFFICE Eoseph H. Oswald,SouthEuclid, and Theodore E. Well, Willoughby, Ohio Application .iuiy 1,1947, Serial No. 758,296 3 Claims. (01.292-175) The invention relates tolocking or fastening devices of the spring bolt type.

It is an object of the invention to produce a spring bolt which caneasily be mounted in a wood window sash or other panel structure bysimply forcing it into a hole drilled to receive it and which is notlikely to. loosen or be dislodged in use. 7

Another object of the invention is to provide a spring bolt having partsthat can be manufactured at low cost and easily assembled to produce adevice that is both rugged and durable and unlikely to get out of order.

With these ends in view the invention consists in certain forms,combinations and arrangements of parts which will, hereinafter be eX-plained and claimed, the explanation being presented in conjunction withthe accompanying drawing showing a preferred formof the variousconstructions in which the invention can be embodied.

In the drawing,

Fig. 1 is a fragmentary inside elevation of a window sash and frame withthe improved spring bolt mounted in the sash.

Fig. 2 is a view on a larger scale of the unmounted spring bolt, theview being partly in longitudinal axial section and partly in sideelevation.

Fig. 3 is a section on the line 3-3 of Fig. 2.

In the construction shown in the drawing A (Fig. 1) designates a portionof a window frame, 33 part of the stile of an associated window or stormsash and C designates generally the improved spring bolt mounted in thesash. The construction of the spring bolt is shown in detail in Figs. 2and 3 where the numeral I designates as an entirety a tubular casingwhich is formed at one end with an inturned flange la. Adjacent one ofits ends the casing i has an annular portion of its exterior surfaceknurled and preferably this knurling is disposed adjacent the end of thecasing remote from the flange la, as is shown at lb in the drawing. Thisknurling of the casing is carried out in a manner to raise sharp edgesso that the overall diameter of the knurled zone is slightly (preferablyabout 0.020) greater than the diameter of the unknurled part of thecasing.

Slidably mounted in the casing I is a round bolt designated as anentirety by the numeral 2 and having a portion 2a of larger diameterthan a second portion 2b with a resultant shoulder 20 at the junctionsof these two portions. Adjacent the larger portion 2a the bolt is formedwith a 2 conical taper 202 which terminates in end 2e.

A coil spring 3. preferably of stainless steel, surrounds portion 21) ofthe bolt with one end of the spring engaging the shoulder 20 of the boltand its other end engaging the flange la of the casing. i

The bolt is fitted with a handie member 5 which in the constructionshown is of straight rod-like form and has at one end an axial hole Aladrilled of a size to fit the end of the smaller sections of the boltwhich projects beyond the flange la of the casing. To fasten the handlerigidly to the bolt the latter is notched and the handle islolcailydeformed to interlock with the notch. Preferably two such interlockingengagements are provided by oppositely arranged notches 2122 in the boltand corresponding indented portions ib, ib of the handle.

A spring bolt structure such as that shown and described is susceptibleof manufacture at remarkably low cost. All of the parts except thespring 3 are preferably formed of brass and with the exception of twooperations the parts can be rapidly produced on automatic screwmachines. The casing l is, of course, formed from tubing and can haveits knurled zone lb rapidly formed. The flange la of the casing can beformed by a combined cutoff and spinning operation. The bolt 2 andhandle 4 are formed from plain round rod stock and their several formingoperations are obviously well suited to screw machine work except forthe notching of the bolt and the deforming of the handle to efifect itsattachment to the bolt. These latter two operations, however, arereadily carried out. The notching of the bolt 2 is effected by holdingthe cylindrical bolt in a die having a cavity of corresponding shape sothat when the metal of the bolt is deformed to produce the oppositenotches 2f the displacement of the metal is accommodated by endwisemovea rounded ment in the die so that the overall diameter of I the boltis not altered. The deforming of the handle part to effect its interlockwith the bolt is obviously a simple and easily performed operation.

The use of a stainless steel sprin has a marked advantage over a bronzespring by reason of its longer life Without loss of form; and the costof the stainless steel spring is as low or lower than that of a goodbronze spring.

In the use of the spring bolt a hole is drilled in the window sash of adiameter equal to the outer diameter of the unknurled part of the springbolt casing. With the form of spring bolt which with great firmness sothat it cannot be dislodged in the ordinary use and operation of thedevice. It has been observed that the eiiect oi the knurled surface ofthe bolt casing, when the casing is inserted in the sash, is that thesharp metal edges thrown up by the knurling operation shave a thin layerof the wood from the hole surface and compact it between the casing andthe solid wood. 'Thus in effect a tight pressed fit is attained with:respect to the relatively narrow knurled band 'while a less tight, butfirm, fit is secured between the remainder of the casing member and the7 Wood of the sash.

It'will be appreciated that the manner of attaching the handle to thespring bolt effects a strong and rigid connection which cannot beloosened for either endwise or rotary relative movement of the partsto'cause trouble in the use of the device. A series of handle memberscan be formed of different lengths (by varying the dimension :0indicated in Fig. 2 0f the drawing) and simply by the use of'thesehandles of different lengths spring bolts suited to sash stiles ofdifferent widths can be produced without varying the dimensions of theother parts of the device. It will be understood that the specific formof 4 construction which has been shown in the draw ings and described,is presented for the purposes of explanation and that the structuresshown can be modified in various respects without departing from theinvention as defined in the appended claims.

What is claimed is:

1. In a spring bolt, the combination of a tubular casing formed at oneend with an inturned flange and having adjacent one end an annular zoneof its outer surface knurled to an over-all diameter somewhat largerthan the diameter of its unknurled surface; a round bolt in the casingformed with two portions of different diameters separated by an annularshoulder facing the inturned flange of the casing, the bolt having itslarger portion slidably fitting the casing and its smaller portionprojecting from the flanged end of the casing and laterally notched toreceive a handle; a coil spring surrounding the smaller portion of thebolt with its ends engaging the shoulder of the bolt and the flangeofthe casing, respectively; and a handle for the bolt formed with a holeto receive the notched portion of the bolt and deformed to haveinterlocking engagement with the notch.

2. A spring bolt as claimed in claim 1' in which the knurled surface ofthe casing is adjacent the end of the casing remote from its inturnedflange.

3. A spring bolt as claimed in claim 1 in which the knurled surface ofthe casing is adjacent the JOSEPH H. OSWALD. THEODORE E. WEIL.

' No references cited.

